VULNERABILITY INTELLIGENCE
CVE-2026-18374
CVSS score4.9 MEDIUM
EPSS probability0.14%
CISA KEVNot currently listed
Published2026-08-27
Last modified2026-09-03
CVSS vectorCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Description
Passing an effectively empty string to the `,ccs=` syntax extension of the mode argument in the `fopen` function in the GNU C Library version 2.45 or earlier may result in a heap buffer overflow when the mode string input to the function is attacker controlled. This usage pattern is not seen in applications in common GNU/Linux distributions and applications that process user-supplied values for `ccs` should not pass them through without validation.
Weakness classification
- 3ff69d7a-14f2-4f67-a097-88dee7810d18: CWE-787
- 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-787